Top 100 Contractors in PSC R4: Professional Services, FY2023

Name: Top 100 Contractors in PSC R4: Professional Services, FY2023
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2022 – Sep 30, 2023 Code page on GovTribe

The top 10 won 19% of FY2023 PSC R4 contract dollars

Contract obligations: $82,690,422,396 Net of deobligations, by contracts coded PSC R4 or a code under it
Contractors: 12,994 Parent companies with an obligation
Largest contractor: Booz Allen Hamilton Holding Corporation $3.24 billion, 3.6% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Booz Allen Hamilton Holding Corporation 7 awardees, including Booz Allen Hamilton Inc. and Aquilent, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$3,240,828,749	3.6%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2024 and #1 in FY2025; unchanged since FY2022.
2	The Boeing Company 25 awardees, including Boeing Sikorsky Aircraft Support, LLC Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) Army (Department of the Army)	$2,244,740,875	2.5%	Rank history: #2 in FY2021, #3 in FY2022, #2 in FY2024 and #2 in FY2025; up 1 since FY2022.
3	General Dynamics Corporation 26 awardees, including General Dynamics Information Technology, Inc., General Dynamics Land Systems Inc. and General Dynamics Global Force, LLC Top agencies Army (Department of the Army) DOS (Department of State) VA (Department of Veterans Affairs)	$2,005,421,822	2.3%	Rank history: #5 in FY2021, #4 in FY2022, #3 in FY2024 and #4 in FY2025; up 1 since FY2022.
4	Science Applications International Corporation 12 awardees, including Forfeiture Support Associates LLC and Engility Services, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$1,776,671,206	2.0%	Rank history: #7 in FY2021, #5 in FY2022, #5 in FY2024 and #7 in FY2025; up 1 since FY2022.
5	Lockheed Martin Corporation 32 awardees, including Lockheed Martin Services, LLC and Lockheed Martin Global, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) NASA (National Aeronautics and Space Administration)	$1,504,336,101	1.7%	Rank history: #11 in FY2021, #7 in FY2022, #6 in FY2024 and #5 in FY2025; up 2 since FY2022.
6	CACI International Inc. 20 awardees, including Caci, Inc. - Federal, Caci Nss, LLC and Caci Technologies, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DTRA (Defense Threat Reduction Agency)	$1,352,705,277	1.5%	Rank history: #13 in FY2021, #10 in FY2022, #7 in FY2024 and #3 in FY2025; up 4 since FY2022.
7	Northrop Grumman Corporation 47 awardees, including Northrop Grumman Systems Corporation Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$1,296,288,952	1.5%	Rank history: #8 in FY2021, #9 in FY2022, #10 in FY2024 and #9 in FY2025; up 2 since FY2022.
8	Chemonics International, Inc. Top agencies USAID (US Agency for International Development)	$1,256,950,969	1.4%	Rank history: #4 in FY2021, #6 in FY2022, #8 in FY2024 and #13 in FY2025; down 2 since FY2022.
9	The Aerospace Corporation Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce) DOI (Department of the Interior)	$1,127,885,870	1.3%	Rank history: #12 in FY2021, #13 in FY2022, #11 in FY2024 and #11 in FY2025; up 4 since FY2022.
10	Leidos Holdings, Inc. 21 awardees, including Leidos, Inc. and Aranea Solutions Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOE (Department of Energy)	$1,056,181,044	1.2%	Rank history: #9 in FY2021, #12 in FY2022, #9 in FY2024 and #10 in FY2025; up 2 since FY2022.
11	Deloitte LLP 6 awardees, including Deloitte Consulting LLP, Deloitte & Touche LLP and Deloitte Financial Advisory Services LLP Top agencies Treasury (Department of the Treasury) HHS (Department of Health and Human Services) DOS (Department of State)	$1,028,815,964	1.2%	Rank history: #6 in FY2021, #11 in FY2022, #4 in FY2024 and #6 in FY2025; unchanged since FY2022.
12	The Mitre Corporation 3 awardees Top agencies USAF (Department of the Air Force) DOT (Department of Transportation) HHS (Department of Health and Human Services)	$1,010,493,116	1.1%	Rank history: #15 in FY2021, #14 in FY2022, #14 in FY2024 and #20 in FY2025; up 2 since FY2022.
13	RTX Corporation 51 awardees, including Raytheon Company, Raytheon / Lockheed Martin Javelin JV and Rockwell Collins, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$958,893,877	1.1%	Rank history: #3 in FY2021, #8 in FY2022 and not on the FY2024–FY2025 lists; down 5 since FY2022.
14	Maximus Inc. 8 awardees, including Maximus Federal Services, Inc., Maximus Federal Technology Solutions, LLC and Q2 Administrators, LLC Top agencies HHS (Department of Health and Human Services) WHS (DOD Washington Headquarters Service) Treasury (Department of the Treasury)	$888,652,014	1.0%	Rank history: #14 in FY2021, #15 in FY2022 and not on the FY2024–FY2025 lists; up 1 since FY2022.
15	BAE Systems PLC 18 awardees, including BAE Systems Land & Armaments L.P., BAE Systems Technology Solutions & Services Inc. and BAE Systems Information and Electronic Systems Integration Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$837,592,460	0.9%	Rank history: #25 in FY2021, #20 in FY2022, #23 in FY2024 and #21 in FY2025; up 5 since FY2022.
16	Savannah River Mission Completion, LLC Top agencies DOE (Department of Energy)	$823,336,868	0.9%	Rank history: not on the FY2021 list, #19 in FY2022, #16 in FY2024 and #15 in FY2025; up 3 since FY2022.
17	L3Harris Technologies, Inc. 32 awardees, including L3Harris Technologies Integrated Systems L.P., L3 Technologies, Inc. and CAE USA Inc. Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce) USSOCOM (United States Special Operations Command)	$781,626,375	0.9%	Rank history: #17 in FY2021, #16 in FY2022, #24 in FY2024 and #23 in FY2025; down 1 since FY2022.
18	Accenture Inc. 2 awardees, including Accenture Federal Services LLC Top agencies Treasury (Department of the Treasury) DHS (Department of Homeland Security) ED (Department of Education)	$778,784,511	0.9%	Rank history: not on the FY2021 list, #30 in FY2022 and not on the FY2024–FY2025 lists; up 12 since FY2022.
19	Parsons Corporation 8 awardees, including Parsons Government Services Inc., Polaris Alpha, LLC and Ptsi Managed Services Inc. Top agencies MDA (DOD Missile Defense Agency) USAF (Department of the Air Force) Navy (Department of the Navy)	$744,300,667	0.8%	Rank history: #22 in FY2021, #22 in FY2022, #19 in FY2024 and #17 in FY2025; up 3 since FY2022.
20	Deloitte Consulting LLP 2 awardees Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) Treasury (Department of the Treasury)	$739,864,723	0.8%	Rank history: not on the FY2021 list, #21 in FY2022, #67 in FY2024 and not on the FY2025 list; up 1 since FY2022.
21	Huntington Ingalls Industries, Inc. 6 awardees, including HII Mission Technologies Corp, HII Fleet Support Group LLC and Fulcrum It Services, LLC Top agencies OSD (Office of the Secretary of Defense) USAF (Department of the Air Force) Army (Department of the Army)	$675,401,035	0.8%	Rank history: #54 in FY2021, #27 in FY2022, #12 in FY2024 and #14 in FY2025; up 6 since FY2022.
22	HP Enterprise Services LLC 16 awardees, including Peraton Inc., Peraton Technology Services Inc. and Peraton Enterprise Solutions LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$649,110,683	0.7%	Rank history: #65 in FY2021, #23 in FY2022 and not on the FY2024–FY2025 lists; up 1 since FY2022.
23	Rapid Deployment Inc. Top agencies HHS (Department of Health and Human Services)	$588,780,106	0.7%	Rank history: #10 in FY2021, #2 in FY2022 and not on the FY2024–FY2025 lists; down 21 since FY2022.
24	Kbr, Inc. 9 awardees, including KBR Wyle Services, LLC and Kord Technologies, LLC Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force) Navy (Department of the Navy)	$560,046,601	0.6%	Rank history: #24 in FY2021, #28 in FY2022, #87 in FY2024 and not on the FY2025 list; up 4 since FY2022.
25	Guidehouse Inc. 2 awardees Top agencies HHS (Department of Health and Human Services) DOS (Department of State) DHS (Department of Homeland Security)	$540,840,456	0.6%	Rank history: #23 in FY2021, #29 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
26	AECOM 13 awardees, including JT4 LLC, AECOM Technical Services, Inc. and AECOM Services, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DHS (Department of Homeland Security)	$539,194,291	0.6%	Rank history: #30 in FY2021, #34 in FY2022, #42 in FY2024 and not on the FY2025 list; up 8 since FY2022.
27	Tetra Tech, Inc. 23 awardees, including Ard, Inc., Management Systems International, Inc. and The Kaizen Company, LLC Top agencies USAID (US Agency for International Development) DOS (Department of State) EPA (Environmental Protection Agency)	$522,725,383	0.6%	Rank history: #28 in FY2021, #26 in FY2022, #25 in FY2024 and #34 in FY2025; down 1 since FY2022.
28	Jacobs Engineering Group Inc. 17 awardees, including Amentum Technology, Inc., The Keyw Corporation and Ch2M Hill, Inc. Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force) Army (Department of the Army)	$477,034,074	0.5%	Rank history: #19 in FY2021, #24 in FY2022 and not on the FY2024–FY2025 lists; down 4 since FY2022.
29	The GEO Group, Inc. 2 awardees, including B.i. Incorporated Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$447,667,028	0.5%	Rank history: #42 in FY2021, #31 in FY2022, #34 in FY2024 and #40 in FY2025; up 2 since FY2022.
30	DAI Global LLC Top agencies USAID (US Agency for International Development)	$412,478,627	0.5%	Rank history: #43 in FY2021, #37 in FY2022, #28 in FY2024 and #48 in FY2025; up 7 since FY2022.
31	The Interpublic Group of Companies Inc 3 awardees, including IPG Dxtra, Inc. Top agencies HHS (Department of Health and Human Services)	$398,852,695	0.4%	Rank history: #27 in FY2021, #36 in FY2022, #39 in FY2024 and not on the FY2025 list; up 5 since FY2022.
32	Serco North America (Holdings) Inc 3 awardees, including Serco Inc., Serco-Ips Corporation and Whitney Bradley & Brown, Inc. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy) DHS (Department of Homeland Security)	$389,850,397	0.4%	Rank history: #21 in FY2021, #17 in FY2022 and not on the FY2024–FY2025 lists; down 15 since FY2022.
33	Alion Science and Technology Corporation 4 awardees, including HII Mission Technologies Corp Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DTRA (Defense Threat Reduction Agency)	$375,525,618	0.4%	Rank history: #38 in FY2021, #77 in FY2022 and not on the FY2024–FY2025 lists; up 44 since FY2022.
34	Amentum Services, Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) Treasury (Department of the Treasury)	$372,209,767	0.4%	Rank history: #20 in FY2021, #32 in FY2022 and not on the FY2024–FY2025 lists; down 2 since FY2022.
35	CGI Technologies and Solutions Inc. 2 awardees, including CGI Federal Inc. Top agencies DOS (Department of State) GSA (General Services Administration) DOI (Department of the Interior)	$361,808,653	0.4%	Rank history: #61 in FY2021, #41 in FY2022 and not on the FY2024–FY2025 lists; up 6 since FY2022.
36	The Boston Consulting Group Inc 2 awardees, including BCG Federal Corp. Top agencies DHA (Defense Health Agency) Navy (Department of the Navy) Army (Department of the Army)	$357,075,869	0.4%	Rank history: #49 in FY2021, #66 in FY2022, #66 in FY2024 and not on the FY2025 list; up 30 since FY2022.
37	General Atomic Technologies Corporation 2 awardees, including General Atomics Aeronautical Systems, Inc. and General Atomics Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) DOE (Department of Energy)	$349,348,906	0.4%	Rank history: #26 in FY2021, #33 in FY2022, #40 in FY2024 and not on the FY2025 list; down 4 since FY2022.
38	ICF International, Inc. 4 awardees, including ICF Incorporated, L.L.C., ICF Macro Inc. and ICF Esac, LLC Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development) EPA (Environmental Protection Agency)	$342,467,810	0.4%	Rank history: #33 in FY2021, #39 in FY2022 and not on the FY2024–FY2025 lists; up 1 since FY2022.
39	Research Triangle Institute 2 awardees Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development) EPA (Environmental Protection Agency)	$314,937,568	0.4%	Rank history: #39 in FY2021, #46 in FY2022, #30 in FY2024 and #60 in FY2025; up 7 since FY2022.
40	Michael Baker International, LLC 3 awardees, including Sallyport Global Holdings Inc. Top agencies USAF (Department of the Air Force) DOS (Department of State)	$298,749,880	0.3%	Rank history: #60 in FY2021, #43 in FY2022, #51 in FY2024 and not on the FY2025 list; up 3 since FY2022.
41	Leonardo S.p.A. 8 awardees, including DRS Network & Imaging Systems LLC, Laurel Technologies Partnership and DRS Sustainment Systems, Inc. Top agencies Army (Department of the Army) USSOCOM (United States Special Operations Command) Navy (Department of the Navy)	$292,283,972	0.3%	Rank history: #85 in FY2021, #88 in FY2022, #57 in FY2024 and #31 in FY2025; up 47 since FY2022.
42	Mantech International Corporation 8 awardees, including Mantech Advanced Systems International, Inc., Mantech SRS Technologies, Inc. and Tapestry Technologies, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DHS (Department of Homeland Security)	$282,177,877	0.3%	Rank history: #18 in FY2021, #18 in FY2022, #47 in FY2024 and #33 in FY2025; down 24 since FY2022.
43	Torch Technologies Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) MDA (DOD Missile Defense Agency)	$275,739,409	0.3%	Rank history: #31 in FY2021, #51 in FY2022, #46 in FY2024 and #37 in FY2025; up 8 since FY2022.
44	Serco Inc 3 awardees, including Serco-Ips Corporation Top agencies Navy (Department of the Navy) DOL (Department of Labor) PBGC (Pension Benefit Guaranty Corporation)	$268,901,170	0.3%	Rank history: not on the FY2021–FY2022 lists, #18 in FY2024 and #18 in FY2025; new.
45	Vera Institute of Justice, Inc. Top agencies HHS (Department of Health and Human Services)	$267,864,324	0.3%	Rank history: #56 in FY2021, #58 in FY2022 and not on the FY2024–FY2025 lists; up 13 since FY2022.
46	Noblis, Inc. 2 awardees, including Noblis MSD LLC Top agencies DOT (Department of Transportation) Navy (Department of the Navy) DHS (Department of Homeland Security)	$260,366,736	0.3%	Rank history: #62 in FY2021, #50 in FY2022, #58 in FY2024 and #63 in FY2025; up 4 since FY2022.
47	Smartronix LLC 2 awardees, including Datastrong, LLC Top agencies Navy (Department of the Navy) DOJ (Department of Justice) USAF (Department of the Air Force)	$260,143,040	0.3%	Rank history: #63 in FY2021, #47 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
48	ABT Global LLC 2 awardees Top agencies USAID (US Agency for International Development) HHS (Department of Health and Human Services) DOL (Department of Labor)	$258,636,250	0.3%	Rank history: #32 in FY2021, #40 in FY2022, #45 in FY2024 and #56 in FY2025; down 8 since FY2022.
49	International Business Machines Corporation 5 awardees Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs) DMEA (Defense Microelectronics Activity)	$257,917,410	0.3%	Rank history: #47 in FY2021, #44 in FY2022, #50 in FY2024 and #52 in FY2025; down 5 since FY2022.
50	Microsoft Corporation Top agencies Navy (Department of the Navy) Army (Department of the Army) DISA (Defense Information Systems Agency)	$255,509,316	0.3%	Rank history: #45 in FY2021, #49 in FY2022, #36 in FY2024 and #39 in FY2025; down 1 since FY2022.
51	Range Generation Next LLC Top agencies USAF (Department of the Air Force)	$241,470,217	0.3%	Rank history: #51 in FY2021, #61 in FY2022, #63 in FY2024 and not on the FY2025 list; up 10 since FY2022.
52	Credence Management Solutions Limited Liability Company Top agencies USAID (US Agency for International Development) USAF (Department of the Air Force) DOJ (Department of Justice)	$238,129,125	0.3%	Rank history: #68 in FY2021, #57 in FY2022, #49 in FY2024 and #55 in FY2025; up 5 since FY2022.
53	Ernst & Young LLP Top agencies Army (Department of the Army) DOJ (Department of Justice) HHS (Department of Health and Human Services)	$236,829,656	0.3%	Rank history: not on the FY2021 list, #95 in FY2022 and not on the FY2024–FY2025 lists; up 42 since FY2022.
54	DCS Corporation Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$231,918,363	0.3%	Rank history: #53 in FY2021, #54 in FY2022, #83 in FY2024 and #92 in FY2025; unchanged since FY2022.
55	Deployed Services, LLC Top agencies HHS (Department of Health and Human Services)	$213,423,508	0.2%	Rank history: not on the FY2021–FY2022 lists, #89 in FY2024 and not on the FY2025 list; new.
56	Applied Research Associates, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) DTRA (Defense Threat Reduction Agency)	$210,448,550	0.2%	Rank history: not on the FY2021 list, #73 in FY2022, #72 in FY2024 and #76 in FY2025; up 17 since FY2022.
57	PAE Government Services Inc. 8 awardees, including PAE Professional Services, LLC, PAE Applied Technologies LLC and Centra Technology, Inc. Top agencies DOS (Department of State) DOJ (Department of Justice) DHS (Department of Homeland Security)	$209,874,471	0.2%	Rank history: #35 in FY2021, #45 in FY2022 and not on the FY2024–FY2025 lists; down 12 since FY2022.
58	Koniag, Inc. 9 awardees, including Tuknik Government Services LLC, Kadiak LLC and Pacarctic, LLC Top agencies DOS (Department of State) HHS (Department of Health and Human Services) DISA (Defense Information Systems Agency)	$201,424,279	0.2%	Rank history: #84 in FY2021, #63 in FY2022 and not on the FY2024–FY2025 lists; up 5 since FY2022.
59	On Assignment, Inc. 7 awardees, including ECS Federal, LLC, Enterprise Resource Performance, LLC and Iron Vine Security LLC Top agencies DARPA (Defense Advanced Research Projects Agency) DOJ (Department of Justice) VA (Department of Veterans Affairs)	$199,695,525	0.2%	Rank history: #70 in FY2021, #72 in FY2022 and not on the FY2024–FY2025 lists; up 13 since FY2022.
60	Systems Planning and Analysis, Inc. Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense) DTRA (Defense Threat Reduction Agency)	$199,284,261	0.2%	Rank history: #93 in FY2021, #78 in FY2022, #53 in FY2024 and #42 in FY2025; up 18 since FY2022.
61	Aaski Technology Inc. 4 awardees, including Mag DS Corp and Ausley Associates, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$197,106,397	0.2%	Rank history: #57 in FY2021, #42 in FY2022 and not on the FY2024–FY2025 lists; down 19 since FY2022.
62	Oasis Systems, LLC Top agencies USAF (Department of the Air Force) DOT (Department of Transportation) CFTC (Commodity Futures Trading Commission)	$194,070,061	0.2%	Rank history: #86 in FY2021, #48 in FY2022, #60 in FY2024 and #53 in FY2025; down 14 since FY2022.
63	Ingenesis Inc. 2 awardees, including Kelly Services, Inc. Top agencies HHS (Department of Health and Human Services) EEOC (Equal Employment Opportunity Commission)	$193,729,674	0.2%	Rank history: #44 in FY2021, #55 in FY2022 and not on the FY2024–FY2025 lists; down 8 since FY2022.
64	Arctic Slope Regional Corporation 16 awardees, including Netcentric Technology, LLC, Asrc Federal System Solutions LLC and Asrc Federal Professional Services, LLC Top agencies DOT (Department of Transportation) USAF (Department of the Air Force) DCSA (Defense Counterintelligence and Security Agency)	$192,320,404	0.2%	Rank history: #48 in FY2021, #53 in FY2022, #48 in FY2024 and #26 in FY2025; down 11 since FY2022.
65	SRC Inc. 2 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$190,172,941	0.2%	Rank history: not on the FY2021 list, #96 in FY2022, #41 in FY2024 and #58 in FY2025; up 31 since FY2022.
66	Mathematica Inc 2 awardees Top agencies HHS (Department of Health and Human Services) ED (Department of Education) SSA (Social Security Administration)	$187,245,968	0.2%	Rank history: #52 in FY2021, #56 in FY2022 and not on the FY2024–FY2025 lists; down 10 since FY2022.
67	Magellan Health, Inc. 2 awardees, including Magellan Federal, Inc. and Magellan Healthcare Inc. Top agencies Army (Department of the Army) DODEA (Department of Defense Education Activity) DHA (Defense Health Agency)	$185,753,963	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 85 since FY2022.
68	H.i.g. Capital Management Inc. 3 awardees, including Empower AI, Inc. and Iron Bow Technologies, LLC Top agencies VA (Department of Veterans Affairs) OSD (Office of the Secretary of Defense) Army (Department of the Army)	$182,408,926	0.2%	Rank history: #55 in FY2021, #52 in FY2022 and not on the FY2024–FY2025 lists; down 16 since FY2022.
69	National Exchange Carrier Association Inc. Through Universal Service Administrative Company Top agencies FCC (Federal Communications Commission)	$174,722,555	0.2%	Rank history: #94 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 144 since FY2022.
70	Linquest Corporation 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$173,004,452	0.2%	Rank history: #69 in FY2021, #86 in FY2022, #70 in FY2024 and #62 in FY2025; up 16 since FY2022.
71	Kpmg L.L.P. 2 awardees Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services) DCSA (Defense Counterintelligence and Security Agency)	$167,849,697	0.2%	Rank history: #96 in FY2021, #76 in FY2022 and not on the FY2024–FY2025 lists; up 5 since FY2022.
72	Advanced Technology Systems Inc. 3 awardees, including Salient Crgt, Inc. and Salient Federal-Sgis Inc. Top agencies USAF (Department of the Air Force) PBGC (Pension Benefit Guaranty Corporation) VA (Department of Veterans Affairs)	$162,219,892	0.2%	Rank history: #89 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
73	Sev1Tech, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) Navy (Department of the Navy)	$162,161,255	0.2%	Rank history: #76 in FY2021, #82 in FY2022, #80 in FY2024 and #57 in FY2025; up 9 since FY2022.
74	LMI Consulting, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$161,242,024	0.2%	Rank history: not on the FY2021 list, #68 in FY2022, #38 in FY2024 and #45 in FY2025; down 6 since FY2022.
75	Gryphon Technologies, Inc. 5 awardees, including Gryphon Technologies, L.C., Schafer Government Services, LLC and Gryphon Marine, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DARPA (Defense Advanced Research Projects Agency)	$160,400,024	0.2%	Rank history: #79 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 30 since FY2022.
76	Clear Vantage Point Solutions II LLC Top agencies VA (Department of Veterans Affairs)	$154,948,480	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
77	Westat, Inc. Top agencies HHS (Department of Health and Human Services) ED (Department of Education) NSF (National Science Foundation)	$154,285,882	0.2%	Rank history: #77 in FY2021, #60 in FY2022, #54 in FY2024 and not on the FY2025 list; down 17 since FY2022.
78	Cherokee Nation 11 awardees, including Cherokee Nation Strategic Programs, L.L.C., Cherokee Nation Management & Consulting, L.l.c.. and Cherokee Federal Solutions, L.L.C. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) DHA (Defense Health Agency)	$153,558,109	0.2%	Rank history: #67 in FY2021, #80 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
79	National Collegiate Inventors & Innovators Alliance, Inc. Top agencies HHS (Department of Health and Human Services)	$149,577,440	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 136 since FY2022.
80	Georgia TECH Research Corp 2 awardees, including Georgia TECH Applied Research Corp Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$144,125,983	0.2%	Rank history: #78 in FY2021, #74 in FY2022 and not on the FY2024–FY2025 lists; down 6 since FY2022.
81	National Opinion Research Center Top agencies HHS (Department of Health and Human Services) USAID (US Agency for International Development) SEC (Securities and Exchange Commission)	$142,511,180	0.2%	Rank history: #99 in FY2021, #89 in FY2022 and not on the FY2024–FY2025 lists; up 8 since FY2022.
82	The Johns Hopkins University 3 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC and Broadway Services, Incorporated Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) USSOCOM (United States Special Operations Command)	$139,453,118	0.2%	Rank history: not on the FY2021 list, #99 in FY2022 and not on the FY2024–FY2025 lists; up 17 since FY2022.
83	Aerodyne-Sgt Engineering Services, LLC Top agencies NASA (National Aeronautics and Space Administration)	$136,296,185	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 168 since FY2022.
84	Data Computer Corporation of America Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$134,481,002	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
85	Axle Informatics, LLC Top agencies HHS (Department of Health and Human Services)	$133,057,389	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #90 in FY2025; up 24 since FY2022.
86	Precise Systems, Inc. Top agencies Navy (Department of the Navy)	$132,115,340	0.1%	Rank history: not on the FY2021–FY2022 lists, #75 in FY2024 and #87 in FY2025; up 16 since FY2022.
87	Cognosante Holdings, LLC 3 awardees, including Cognosante MVH LLC and Cognosante, LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) SSA (Social Security Administration)	$131,884,194	0.1%	Rank history: #75 in FY2021, #69 in FY2022, #90 in FY2024 and not on the FY2025 list; down 18 since FY2022.
88	Signature Choice, LLC Top agencies VA (Department of Veterans Affairs)	$130,386,323	0.1%	Rank history: #83 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 18 since FY2022.
89	Nova Global Supply and Services LLC 3 awardees, including Valiant Global Defense Services Inc. and Valiant Technical Services Inc. Top agencies Army (Department of the Army) DTRA (Defense Threat Reduction Agency) USAF (Department of the Air Force)	$129,244,002	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 21 since FY2022.
90	UIC Government Services LLC 12 awardees, including Bowhead Mission Solutions, LLC, Bowhead Professional and Technical Solutions LLC and Bowhead Business and Technology Solutions, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$128,025,987	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 13 since FY2022.
91	Fluor Corporation 2 awardees, including Fluor Enterprises, Inc. and Fluor Federal Services Inc. Top agencies DHS (Department of Homeland Security)	$127,420,840	0.1%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2024 and #54 in FY2025; up 91 since FY2022.
92	LS Technologies LLC Top agencies DOT (Department of Transportation)	$127,031,155	0.1%	Rank history: #82 in FY2021, #83 in FY2022 and not on the FY2024–FY2025 lists; down 9 since FY2022.
93	American Institutes for Research In the Behavioral Sciences 3 awardees, including Growth Transitions Inc. Top agencies ED (Department of Education) HHS (Department of Health and Human Services) USAID (US Agency for International Development)	$125,931,396	0.1%	Rank history: not on the FY2021 list, #97 in FY2022, #84 in FY2024 and not on the FY2025 list; up 4 since FY2022.
94	Carahsoft Technology Corp Top agencies HHS (Department of Health and Human Services) Treasury (Department of the Treasury) USAID (US Agency for International Development)	$122,982,841	0.1%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2024 and #65 in FY2025; new.
95	Sapient Corporation 3 awardees, including Plowshare Group, Inc., Sapient Government Services, Inc. and Onpoint Consulting, Inc. Top agencies HHS (Department of Health and Human Services)	$122,893,668	0.1%	Rank history: #100 in FY2021, #100 in FY2022 and not on the FY2024–FY2025 lists; up 5 since FY2022.
96	Omniplex World Services Corp 2 awardees, including Triple Canopy Inc. Top agencies DOS (Department of State) USAF (Department of the Air Force) CSOSA (Court Services and Offender Supervision Agency)	$121,888,185	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
97	Inter-Con Security Systems, Inc. Top agencies DOS (Department of State) DOJ (Department of Justice)	$121,364,299	0.1%	Rank history: #80 in FY2021, #79 in FY2022 and not on the FY2024–FY2025 lists; down 18 since FY2022.
98	The Dewberry Companies LC Through Dewberry Engineers Inc. Top agencies DHS (Department of Homeland Security) DOT (Department of Transportation)	$119,484,104	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 30 since FY2022.
99	Govcio, LLC Top agencies VA (Department of Veterans Affairs)	$119,155,107	0.1%	Rank history: not on the FY2021 list, #67 in FY2022 and not on the FY2024–FY2025 lists; down 32 since FY2022.
100	System One Holdings, LLC Through Gap Solutions, Inc. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services) OSD (Office of the Secretary of Defense)	$118,786,481	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 16 since FY2022.

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100 of 12,994 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC R4

Code	Net obligations	Largest contractor
R425 Engineering and Technical Services	$31,674,693,592	Lockheed Martin Corporation
R499 Other Professional Services	$28,596,901,874	Booz Allen Hamilton Holding Corporation
R408 Program Management/Support Services	$12,583,896,936	General Dynamics Corporation
R429 Support – Professional: Emergency Response/Disaster Planning/Preparedness Support	$1,497,798,332	Rapid Deployment Inc.
R410 Support – Professional: Program Evaluation/Review/Development	$1,437,556,122	Clear Vantage Point Solutions II LLC
R426 Communications Services	$1,270,267,557	The Interpublic Group of Companies Inc
R418 Legal Services	$994,043,023	Vera Institute of Justice, Inc.
R430 Support – Professional: Physical Security and Badging	$954,886,205	Omniplex World Services Corp
R431 Support – Professional: Human Resources	$617,907,004	Accenture Inc.
R497 Personal Services Contracts	$538,977,729	Accenture Inc.
R405 Operations Research and Quantitative Analysis Services	$512,802,902	Leidos Holdings, Inc.
R423 Intelligence Services	$400,953,191	Altamira Technologies Corporation
R424 Expert Witness	$344,825,637	Georgia TECH Research Corp
R422 Market Research and Public Opinion Services (includes telephone and field interviews, focus testing, and surveys)	$244,599,031	Westat, Inc.
R412 Simulation	$241,239,678	Northrop Grumman Corporation
R406 Policy Review/Development Services	$198,122,362	Eagle Hill Consulting LLC
R415 Technology Sharing/Utilization Services	$155,930,130	Accenture Inc.
R416 Veterinary/Animal Care Services	$128,523,620	Priority One Services, Inc.
R427 Weather Reporting/Observation Services	$96,268,039	Condor Reliability Services, Inc.
R404 Land Surveys, Cadastral Services (non-construction)	$58,187,082	Johnson-Frank & Associates, Inc.
R420 Support – Professional: Certifications and Accreditations (Other Than Education or Information Technology C&A)	$55,387,585	Joint Commission On Accreditation of Healthcare Organizations
R411 Real Property Appraisals Services (SIC 6531)	$38,492,437	Verdi Consulting Inc.
R498 Patent and Trademark Services	$33,076,836	The Boeing Company
R428 Industrial Hygienics	$16,785,760	Cydecor Inc.
R402 Real Estate Brokerage Services	$8,276,832	Vendor Resource Management, Inc.
R401 Personal Care Services (includes such services as barber and beauty shop, shoe repairs, tailoring, etc.)	-$14,483,269	Dependable Health Services Inc

Show all 26

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $89 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2023 ran Oct 1, 2022 – Sep 30, 2023. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2022. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2022 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 PSC R4 contractors in FY2023?

1. Booz Allen Hamilton Holding Corporation ($3.24B), 2. The Boeing Company ($2.24B), 3. General Dynamics Corporation ($2.01B), 4. Science Applications International Corporation ($1.78B), 5. Lockheed Martin Corporation ($1.5B), 6. CACI International Inc. ($1.35B), 7. Northrop Grumman Corporation ($1.3B), 8. Chemonics International, Inc. ($1.26B), 9. The Aerospace Corporation ($1.13B), 10. Leidos Holdings, Inc. ($1.06B).

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